The invention relates to a micro-boron treatment wide and thick plate with tensile strength grade of 700MPa and a production method of wide and thick plate and belongs to the technical field of production of a wide and thick plate. In a smelting process, the weight percentage of the components are controlled as follows: 0.07-0.09% of C, less than or equal to 0.0040% of N, less than or equal to 0.012% of P, less than or equal to 0.005% of S, and 0.0005-0.0010% of B; carbon equivalent is kept in a scope of 0.43-0.48, and 0.015-0.025% of Ti is added; a stepping beam type heating furnace is adopted to heat a plate blank to 1160-1220 DEG C; two stages of rolling and cooling control are adopted; with regard to steel plate thickness of more than 30mm and less than or equal to 50mm, a continuous casting with specification of 300mm thick is selected; and with regard to steel plate thickness of more than 50mm and less than or equal to 80mm, a continuous casting with specification of 400mm thick is selected. The wide and thick plate and the production method thereof have the advantages of being reasonable in alloy design, low in alloy cost, and capable of stably producing high-strength steel plate with thick specifications.